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Re: Looks like we got a preamp problem...

If the oscillation is subtle, it can take a while for it to ramp itself up and set the amp to singing. Have you tried a grid-stopper on the input pins of the 6N7? If not, solder a 1K carbon resistor right up against the adjacent grid pins and attach your input lead to the other end.

What size output cap are you using in the preamp?

What are the specs on the potted power tranny?

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